Combined curb and drainage system



FIG. 1 is a perspective view of a combined curb and drainage system showing my new design;

FIG. 2 is a left side view thereof, the opposite side being a mirror image;

FIG. 3 is a top view thereof;

FIG. 4 is a front view thereof. 

The ornamental design for a combined curb and drainage system, as shown and described. 